Function prepare

test/adaptive_storage_test.cpp:26–31

template <typename T>
adaptive_storage_type prepare(std::size_t n, const T x) {
  std::unique_ptr<T[]> v(new T[n]);
  std::fill(v.get(), v.get() + n, static_cast<T>(0));
  v.get()[0] = x;
  return adaptive_storage_type(n, v.get());
}

template <typename T>
adaptive_storage_type prepare(std::size_t n) {